linux-kernel - Re: [PATCH v3] mhi: host: Add standard elf image download functionality

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Message-ID: <590f6b8a-02a2-4ec7-ae43-27b267f0cbff@oss.qualcomm.com>
Date: Thu, 18 Dec 2025 10:31:16 -0800
From: Jeff Johnson <jeff.johnson@....qualcomm.com>
To: Qiang Yu <qiang.yu@....qualcomm.com>,
        Manivannan Sadhasivam <mani@...nel.org>
Cc: mhi@...ts.linux.dev, linux-arm-msm@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Mayank Rana <mayank.rana@....qualcomm.com>,
        Baochen Qiang <quic_bqiang@...cinc.com>
Subject: Re: [PATCH v3] mhi: host: Add standard elf image download
 functionality

On 12/1/2025 6:33 PM, Qiang Yu wrote:
> From: Mayank Rana <mayank.rana@....qualcomm.com>
> 
> Currently, the FBC image is a non-standard ELF file that contains a single
> ELF header, followed by segments for SBL, and WLAN FW. However, TME-L
> (Trust Management Engine Lite) supported devices (eg. QCC2072) requires
> separate ELF headers for SBL and WLAN FW segments due to TME-L image
> authentication requirement.
> 
> Current image format contains two sections in a single binary:
> - First 512KB: ELF header + SBL segments
> - Remaining: WLAN FW segments
> 
> The TME-L supported image format contains two sections with two elf
> headers in a single binary:
> - First 512KB: First ELF header + SBL segments
> - Remaining: Second ELF header + WLAN FW segments
> 
> Download behavior:
> - Legacy: 1. First 512KB via BHI (ELF header + SBL)
>           2. Full image via BHIe
> 
> - TME-L: 1. First 512KB via BHI (First ELF header + SBL)
>          2. Remaining via BHIe (Second ELF header + WLAN FW segments)
> 
> Add standard_elf_image flag to mhi_controller_config to indicate TME-L
> supported image format. When set, MHI skips the first 512KB during WLAN FW
> download over BHIe as it is loaded in BHI phase.

FYI the consumer of this functionality is now available:

series:
https://lore.kernel.org/all/20251218-ath12k-support-qcc2072-v1-0-87928cf8e547@oss.qualcomm.com

specific patch:
https://lore.kernel.org/all/20251218-ath12k-support-qcc2072-v1-11-87928cf8e547@oss.qualcomm.com/